flash.delete（：notice）无法在Rails 3.1 RC中使用？

几个月前，我跟着这tutorial。一切都在Rails的3.0.x的工作，但是在Rails的3.1 RC，我得到这个错误：flash.delete（：notice）无法在Rails 3.1 RC中使用？

undefined method `gsub' for #<ActionDispatch::Flash::FlashHash:0x00000108338f20>

有没有什么在改变的Rails 3.1 RC使用闪光灯的对象？看来问题是这一行：

<%= escape_javascript(flash.delete(:notice)) %>

完全跟踪：

actionpack (3.1.0.rc1) lib/action_view/helpers/javascript_helper.rb:21:in `escape_javascript' 
app/views/likes/create.js.erb:4:in `_app_views_likes_create_js_erb___2491329848991146022_2217047840' 
actionpack (3.1.0.rc1) lib/action_view/template.rb:144:in `block in render' 
activesupport (3.1.0.rc1) lib/active_support/notifications.rb:57:in `instrument' 
actionpack (3.1.0.rc1) lib/action_view/template.rb:142:in `render' 
actionpack (3.1.0.rc1) lib/action_view/renderer/template_renderer.rb:40:in `block (2 levels) in render_template' 
actionpack (3.1.0.rc1) lib/action_view/renderer/abstract_renderer.rb:33:in `block in instrument' 
activesupport (3.1.0.rc1) lib/active_support/notifications.rb:55:in `block in instrument' 
activesupport (3.1.0.rc1) lib/active_support/notifications/instrumenter.rb:21:in `instrument' 
activesupport (3.1.0.rc1) lib/active_support/notifications.rb:55:in `instrument' 
actionpack (3.1.0.rc1) lib/action_view/renderer/abstract_renderer.rb:33:in `instrument' 
actionpack (3.1.0.rc1) lib/action_view/renderer/template_renderer.rb:39:in `block in render_template' 
actionpack (3.1.0.rc1) lib/action_view/renderer/template_renderer.rb:47:in `render_with_layout' 
actionpack (3.1.0.rc1) lib/action_view/renderer/template_renderer.rb:38:in `render_template' 
actionpack (3.1.0.rc1) lib/action_view/renderer/template_renderer.rb:12:in `block in render' 
actionpack (3.1.0.rc1) lib/action_view/renderer/abstract_renderer.rb:22:in `wrap_formats' 
actionpack (3.1.0.rc1) lib/action_view/renderer/template_renderer.rb:9:in `render' 
actionpack (3.1.0.rc1) lib/action_view/renderer/renderer.rb:36:in `render_template' 
actionpack (3.1.0.rc1) lib/action_view/renderer/renderer.rb:17:in `render' 
actionpack (3.1.0.rc1) lib/abstract_controller/rendering.rb:120:in `_render_template' 
actionpack (3.1.0.rc1) lib/action_controller/metal/streaming.rb:258:in `_render_template' 
actionpack (3.1.0.rc1) lib/abstract_controller/rendering.rb:114:in `render_to_body' 
actionpack (3.1.0.rc1) lib/action_controller/metal/renderers.rb:30:in `render_to_body' 
actionpack (3.1.0.rc1) lib/action_controller/metal/compatibility.rb:43:in `render_to_body' 
actionpack (3.1.0.rc1) lib/abstract_controller/rendering.rb:99:in `render' 
actionpack (3.1.0.rc1) lib/action_controller/metal/rendering.rb:16:in `render' 
actionpack (3.1.0.rc1) lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render' 
activesupport (3.1.0.rc1) lib/active_support/core_ext/benchmark.rb:5:in `block in ms' 
/Users/Chris/.rvm/rubies/ruby-1.9.2-p136/lib/ruby/1.9.1/benchmark.rb:309:in `realtime' 
activesupport (3.1.0.rc1) lib/active_support/core_ext/benchmark.rb:5:in `ms' 
actionpack (3.1.0.rc1) lib/action_controller/metal/instrumentation.rb:40:in `block in render' 
actionpack (3.1.0.rc1) lib/action_controller/metal/instrumentation.rb:78:in `cleanup_view_runtime' 
activerecord (3.1.0.rc1) lib/active_record/railties/controller_runtime.rb:24:in `cleanup_view_runtime' 
actionpack (3.1.0.rc1) lib/action_controller/metal/instrumentation.rb:39:in `render' 
actionpack (3.1.0.rc1) lib/action_controller/metal/implicit_render.rb:10:in `default_render' 
actionpack (3.1.0.rc1) lib/action_controller/metal/implicit_render.rb:5:in `send_action' 
actionpack (3.1.0.rc1) lib/abstract_controller/base.rb:167:in `process_action' 
actionpack (3.1.0.rc1) lib/action_controller/metal/rendering.rb:10:in `process_action' 
actionpack (3.1.0.rc1) lib/abstract_controller/callbacks.rb:18:in `block in process_action' 
activesupport (3.1.0.rc1) lib/active_support/callbacks.rb:452:in `_run__308249102964749222__process_action__3107984421769475816__callbacks' 
activesupport (3.1.0.rc1) lib/active_support/callbacks.rb:386:in `_run_process_action_callbacks' 
activesupport (3.1.0.rc1) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (3.1.0.rc1) lib/abstract_controller/callbacks.rb:17:in `process_action' 
actionpack (3.1.0.rc1) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action' 
activesupport (3.1.0.rc1) lib/active_support/notifications.rb:55:in `block in instrument' 
activesupport (3.1.0.rc1) lib/active_support/notifications/instrumenter.rb:21:in `instrument' 
activesupport (3.1.0.rc1) lib/active_support/notifications.rb:55:in `instrument' 
actionpack (3.1.0.rc1) lib/action_controller/metal/instrumentation.rb:29:in `process_action' 
actionpack (3.1.0.rc1) lib/action_controller/metal/params_wrapper.rb:202:in `process_action' 
actionpack (3.1.0.rc1) lib/action_controller/metal/rescue.rb:17:in `process_action' 
activerecord (3.1.0.rc1) lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
actionpack (3.1.0.rc1) lib/abstract_controller/base.rb:121:in `process' 
actionpack (3.1.0.rc1) lib/abstract_controller/rendering.rb:45:in `process' 
actionpack (3.1.0.rc1) lib/action_controller/metal.rb:193:in `dispatch' 
actionpack (3.1.0.rc1) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch' 
actionpack (3.1.0.rc1) lib/action_controller/metal.rb:236:in `block in action' 
actionpack (3.1.0.rc1) lib/action_dispatch/routing/route_set.rb:65:in `call' 
actionpack (3.1.0.rc1) lib/action_dispatch/routing/route_set.rb:65:in `dispatch' 
actionpack (3.1.0.rc1) lib/action_dispatch/routing/route_set.rb:29:in `call' 
rack-mount (0.8.1) lib/rack/mount/route_set.rb:152:in `block in call' 
rack-mount (0.8.1) lib/rack/mount/code_generation.rb:93:in `block in recognize' 
rack-mount (0.8.1) lib/rack/mount/code_generation.rb:82:in `optimized_each' 
rack-mount (0.8.1) lib/rack/mount/code_generation.rb:92:in `recognize' 
rack-mount (0.8.1) lib/rack/mount/route_set.rb:141:in `call' 
actionpack (3.1.0.rc1) lib/action_dispatch/routing/route_set.rb:531:in `call' 
/Users/Chris/.rvm/gems/[email protected]/bundler/gems/omniauth-795d965b8961/oa-core/lib/omniauth/strategy.rb:44:in `call!' 
/Users/Chris/.rvm/gems/[email protected]/bundler/gems/omniauth-795d965b8961/oa-core/lib/omniauth/strategy.rb:30:in `call' 
warden (1.0.4) lib/warden/manager.rb:35:in `block in call' 
warden (1.0.4) lib/warden/manager.rb:34:in `catch' 
warden (1.0.4) lib/warden/manager.rb:34:in `call' 
actionpack (3.1.0.rc1) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call' 
rack (1.3.0) lib/rack/etag.rb:23:in `call' 
rack (1.3.0) lib/rack/conditionalget.rb:35:in `call' 
actionpack (3.1.0.rc1) lib/action_dispatch/middleware/head.rb:14:in `call' 
actionpack (3.1.0.rc1) lib/action_dispatch/middleware/params_parser.rb:21:in `call' 
actionpack (3.1.0.rc1) lib/action_dispatch/middleware/flash.rb:243:in `call' 
rack (1.3.0) lib/rack/session/abstract/id.rb:195:in `context' 
rack (1.3.0) lib/rack/session/abstract/id.rb:190:in `call' 
actionpack (3.1.0.rc1) lib/action_dispatch/middleware/cookies.rb:321:in `call' 
activerecord (3.1.0.rc1) lib/active_record/query_cache.rb:54:in `call' 
activerecord (3.1.0.rc1) lib/active_record/connection_adapters/abstract/connection_pool.rb:448:in `call' 
actionpack (3.1.0.rc1) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' 
activesupport (3.1.0.rc1) lib/active_support/callbacks.rb:392:in `_run_call_callbacks' 
activesupport (3.1.0.rc1) lib/active_support/callbacks.rb:81:in `run_callbacks' 
actionpack (3.1.0.rc1) lib/action_dispatch/middleware/callbacks.rb:28:in `call' 
actionpack (3.1.0.rc1) lib/action_dispatch/middleware/reloader.rb:68:in `call' 
rack (1.3.0) lib/rack/sendfile.rb:102:in `call' 
actionpack (3.1.0.rc1) lib/action_dispatch/middleware/remote_ip.rb:48:in `call' 
actionpack (3.1.0.rc1) lib/action_dispatch/middleware/show_exceptions.rb:47:in `call' 
railties (3.1.0.rc1) lib/rails/rack/logger.rb:13:in `call' 
rack (1.3.0) lib/rack/methodoverride.rb:24:in `call' 
rack (1.3.0) lib/rack/runtime.rb:17:in `call' 
activesupport (3.1.0.rc1) lib/active_support/cache/strategy/local_cache.rb:72:in `call' 
rack (1.3.0) lib/rack/lock.rb:34:in `call' 
actionpack (3.1.0.rc1) lib/action_dispatch/middleware/static.rb:53:in `call' 
railties (3.1.0.rc1) lib/rails/rack/content_length.rb:16:in `call' 
railties (3.1.0.rc1) lib/rails/engine.rb:438:in `call' 
railties (3.1.0.rc1) lib/rails/rack/log_tailer.rb:14:in `call' 
rack (1.3.0) lib/rack/handler/webrick.rb:59:in `service' 
/Users/Chris/.rvm/rubies/ruby-1.9.2-p136/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service' 
/Users/Chris/.rvm/rubies/ruby-1.9.2-p136/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run' 
/Users/Chris/.rvm/rubies/ruby-1.9.2-p136/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'

来源

2011-05-29 Christian Fazzini

什么是'flash.delete（：notice）.class.name'的输出？希望它是'String'而不是'FlashHash'？也许不知何故'flash'被嵌入到'flash [：notice]'本身？ – Zabba 2011-05-29 20:11:09

嗨Zabba，很好的观察。 flash.delete（：notice）.class.name返回ActionDispatch :: Flash :: FlashHash。这是正常的吗？ – 2011-05-29 21:45:35

“puts flash [：notice]”在rails console/terminal中返回实际的Flash消息。所以我不知道为什么这不起作用 – 2011-05-29 21:49:21

FlashHash在3.0.x和3.1.x之间发生了变化。

In Rails 3.0.x, FlashHash was derived from Hash。因此，当您拨打delete时，它是Hash的delete调用 - 它删除指定的密钥并返回该密钥的值。

In Rails 3.1, FlashHash is not derived from Hash - 它包括Enumerable。并且FlashHash#delete返回self，即FlashHash。因此，你的错误。

为什么Rails团队需要改变这一点，超越了我。

我猜你需要在这两个3.0.x和3.1工作的解决方法：

escape_javascript(flash[:notice]) 
flash[:notice] = nil

来源

2011-05-29 22:07:37 Zabba

真棒参考！从阅读这些链接，我收集了3.1 flash.discard（：notice）似乎在Rails 3.0.X中对flash.delete（：notice）的行为类似。 – 2011-05-29 22:19:10

我认为他们已经改变了这个，因为[Liskov替代原则]（http：//en.wikipedia。组织/维基/ Liskov_substitution_principle）。 – rdvdijk 2011-06-03 08:50:09

在Rails 3，它更向使用：在redirect_to时设置的通知的通知选项。有可能某些flash的方法在3.0中被弃用，现在被删除。我不确定最好的解决方案是什么，也许只是将它设置为零。

flash[:notice] = nil 

# in your view: 
<% if notice %> 
    <%= notice %> 
<% end %>

如果你正在尝试设置jQuery，它现在默认为3.1。

来源

2011-05-29 21:19:51 agmcleod

我不想在重定向上设置闪光灯。闪光消息已被设置。问题是，它不在create.js.erb中显示Flash消息 – 2011-05-29 21:44:09

也许我误解了。但我同意其他评论主题。如果您只想查看通知，请在视图中使用flash [：notice]。 – agmcleod 2011-05-29 22:05:08

使用flash.discard(:notice)

（礼貌基督徒，我加入这个解决方案更好的可视性）

来源

2011-10-21 21:37:25 gertas

flash.delete（：notice）无法在Rails 3.1 RC中使用？

回答

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